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Despite this forum's obvious obsession, weight doesn't mean that much if it's only a couple hundred grams and you're not climbing the whole race. The rear wheel has a bunch of dirty air flowing over it too, so the aero difference probably isn't that bad. I actually like having heavier wheels for crits because they're stiffer and more confidence-inspiring. If you like racing with power, go for it!

If you do decide to use it in a race though, I would recommend against having it somewhere viewable- put some tape over it or something (except for the watch feature). This is based off of personal experience- in crits especially you will be pushing a lot more watts than you think you can for the time you're doing, so when you look down it can be a bit mentally discouraging. Trick is to just listen to your body and use the power data as a post-race analysis tool.

If you want the data you'll have to use the PT/Open Pro. It won't hold you back except mentally although that might be a niggle for you. Perhaps you have some races that are more targetted than others? Then use your fast wheels for the races you think you'll do best in.

What can you do with power data from a road race? A lot of UK time-triallists use power but the idea there is that you can use the data to modify your approach so as to have a more even distribution of effort over the course. But in a RR you're just going to have to match the moves if you want to win, I would have thought.